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It's part of their business model. Repeat customers. Why else would they build it out of the cheap plastic. You know we buy more fish food every month or two, so why not some supplies like the facet adapter. Hopefully tank manufacturers don't start thinking like this!

I actually switched my adapter to the Aqueon adapter. It seems to be much higher quality. I went through 3 Python adapters before I switched. I like the Aqueon adapter much better for a couple of reasons. First, the quality is better, second, the switch between draining and filling is actually a lever on the side of the adapter, much easier to use.